Glaucon (bef. 389 BC, d. 409 BC) son of Ariston, was Plato's older brother. His mother was Perictione and he was born in Collytus, just outside of Athens. Glaucon was eulogized after the Battle of Megara in 409. Centuries: 5th century BC - 4th century BC - 3rd century BC Decades: 430s BC 420s BC 410s BC 400s BC 390s BC - 380s BC - 370s BC 360s BC 350s BC 340s BC 330s BC 394 BC 393 BC 392 BC 391 BC 390 BC 389 BC 388 BC 387 BC 386... Centuries: 6th century BC - 5th century BC - 4th century BC Decades: 450s BC 440s BC 430s BC 420s BC 410s BC - 400s BC - 390s BC 380s BC 370s BC 360s BC 350s BC Years: 414 BC 413 BC 412 BC 411 BC 410 BC - 409 BC - 408 BC 407 BC... Ariston was the father of the Greek philosopher Plato. ... For other uses, see Plato (disambiguation). ... Perictione was the mother of the Greek philosopher Plato. ... The Battle of Megara was fought in 424 BC between Athens and Megara, an ally of Sparta. ...
Glaucon is featured in many of Plato's dialogues (e.g., Parmenides, Republic and Symposium) Parmenides is one of the dialogues of Plato. ... The Republic (Greek: ) is an influential work of philosophy and political theory by the Greek philosopher Plato, written in approximately 360 BC. It is written in the format of a Socratic dialogue. ... The Symposium is a dialogue by Plato, written soon after 385 BCE. It is a philosophical discussion on the nature of love, taking the form of a series of speeches, both satirical and serious, given by a group of men at a symposion or drinking party at the house of...
An important part of Glaucon's speech is his explanation of the origin of morality--actually what he takes to be the prevailing conception of morality.
It is important because the theory of human nature that Glaucon uses to explain the prevalence of this conception is used later to advance his main argument.
Glaucon is trying to show that the (best) explanation for the origin and widespread acceptance of morality, understood as the rule that we should neither injure others nor be injured by them, are the general psychological "facts":
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